Main Entry: un·cer·tain

Pronunciation: \ˌən-ˈsər-t^ən\

Function: adjective

Date: 14th century

1 : indefinite, indeterminate <the time of departure is uncertain>
2 : not certain to occur : problematical <his success was uncertain>
3 : not reliable : untrustworthy <an uncertain ally>
4 a : not known beyond doubt : dubious <an uncertain claim> b : not having certain knowledge : doubtful <remains uncertain about her plans> c : not clearly identified or defined <a fire of uncertain origin>
5 : not constant : variable, fitful <an uncertain breeze>

— un·cer·tain·ly adverb

— un·cer·tain·ness \-t^ən-(n)əs\ noun